On November 23, 1969, Colonel Satchel Waide launched a mixed force of US Marines and US Army Paratroopers to attack a target in Cambodia, three years before the US secretly began operations there. The target was a dangerous Unnatural Entity which had bedeviled US forces in Burma during World War II, and Malaya in 1955. The plan was to be the culmination of the Delta Green Special Access Program's mission in Vietnam. Can you survive the horrors of the Unnatural as a heavily armed paratrooper? Find out in Operation OBSIDIAN Part I.